Closeup of the above specimen. This is the back side of the colony and you can see striations running along the length of the segments.
While the last two specimens were somewhat isolated, this third specimen is still in the matrix. You can see all the debris it has been swept up with which includes Crinoid columnals, pieces of Bryozoans, Brachiopods, Trilobites and Ostracods. Due to the broken nature of most of the fossils in the rock I would think they were accumulated and deposited after a storm event.